Google Sheets to OpenAI is a script for Google Sheets that allows users to connect their Google Sheets with the OpenAI API (GPT-4 and GPT-3.5 models) without third-party tools like Zapier or Make. It provides instant access to responses from the API and can be used to generate content for 1000s of rows at once. The script is easy to use and can be purchased for a one-time fee of $10.